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Experimental Investigation and Visualization Study of the Condensation Characteristics in a Propylene Loop Heat Pipe

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Journal of Thermal Science 2021年第5期30卷 1803-1813页

作者： yan Kaifenu XIE Rongjian li Nanxi XU Guangming WU Yinong University of Chinese Academy of Sciences Beijing 100049China Shanghai Institute of Technology and Physics Shanghai 200083China

At present,the structural design of a loop heat pipe(LHP)condenser mostly relies on *** analyze the condensation flow pattern in an LHP and to find a more accurate empirical correlation that can better guide condenser design in existing empirical correlations,a test system was designed and fabricated to observe the condensation phenomenon in the condenser and to evaluate the LHP’s heat transfer *** propylene has a wide temperature range to different temperature control requirements,it was chosen as the working *** this paper,the condensation process in the condenser was observed,and the operating parameters of a propylene LHP were measured at 283 *** condensation flow patterns in the 2.5 mm×2.5 mm channel mainly included stratified flow,wavy flow and intermittent *** comparing the experimental results with four typical condensation flow regime maps,it was found that the Breber and Cavallini flow regime maps can successfully predict most of the condensation flow patterns of the LHP even with ultra-small mass *** addition,four condensation heat transfer coefficient correlations were selected to compare the predicted values of heat transfer coefficient with the experimental *** study showed that the predicted values from the correlation by Cavallini et *** 90%of the experimental values well with an error of less than 20%,and this correlation is recommended for highly accurate LHP design.

关键词： loop heat pipe condensation visualization flow pattern

Effect of bastnaesite as reductant on hematite reduction during in-situ suspension magnetization roasting of refractory iron ore under neutral atmosphere

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International Journal of Mining Science and Technology 2022年第4期32卷 877-886页

作者： Wenbo li Jijia Chen Wentao Zhou Yuexin Han yan Shan School of Resources and Civil Engineering Northeastern UniversityShenyang 110819China National-Local Joint Engineering Research Center of High-Efficient Exploitation Technology for Refractory Iron Ore Resources Shenyang 110819China

The iron tailings of Bayan Obo mines are solid waste,which occupies land area and also causes environmental pollution;however,this waste can be *** this study,based on the characteristics of iron minerals and fluorocarbonate contained in Bayan Obo iron tailings,clean magnetization roasting of iron minerals by bastnaesite from iron tailings during in-situ suspension magnetization roasting in a neutral atmosphere was *** results show that for iron tailings with a mass of 12 g,a N_(2) gas flow rate of 600 mL/min,and roasting for 5 min at 800℃,iron concentrate with a 60.44%iron grade at an iron recovery of 76.04%could be obtained.X-ray diffraction analysis showed that the weak magnetic hematite was reduced to strong magnetic magnetite in the neutral atmosphere,without additional *** kinetics of the magnetization roasting of mineral mixtures(bastnaesite and hematite)in a neutral atmosphere showed that the optimal reaction mechanism function was the three-dimensional diffusion model with activation energy of 161.8838 kJ·mol^(-1);this indicates that the reaction was a heterogeneous,diffusion-controlled solid-state reaction.

关键词： Bayan Obo iron tailings In-situ suspension roasting Clean recovery Phase magnetic transformation Kinetics mechanism

Dynamics of Quantum Fisher Information in Homodyne-Mediated Feedback Control

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Chinese Physics Letters 2019年第3期36卷 14-18页

作者： li Chen Dong yan li-Jun Song Shou Zhang School of Science Changchun University Key Laboratory of Materials Design and Quantum Simulation Changchun University School of Information Engineering Jilin Engineering Normal University Department of Physics College of Science Yanbian University

We investigate the quantum Fisher information(QFI) dynamics of a dissipative two-level system in homodynemediated quantum feedback control. The analytical results demonstrate that the maximum values and stable values of the QFI can be greatly enhanced via feedback control. The quantum feedback plays a more evident role in the improvement of classical Fisher information. The classical part can reach a high stable value, while the quantum part eventually decays to zero whatever the feedback parameter is.

关键词： Dynamics Fisher Information Feedback Control

PMo/BWO光催化降解水中亚甲基蓝的性能和机理

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应用化工 2025年第1期54卷 186-192页

作者：李静李帅李征李杨松胡乐河北工业大学土木与交通学院天津300401 中国市政工程华北设计研究总院有限公司第一设计研究院天津300074

通过沉淀和浸渍法制备出PMo/BWO_(9)异质结复合光催化剂,进行光催化降解亚甲蓝(MB)研究。结果表明,400℃煅烧的PMo/BWO_(9)具有优异光催化性能,可在90 min可见光照射下降解99.5%的MB。PMo/BWO_(9)的反应速率常数是BWO的4.18倍,且经过5... 详细信息

通过沉淀和浸渍法制备出PMo/BWO_(9)异质结复合光催化剂,进行光催化降解亚甲蓝(MB)研究。结果表明,400℃煅烧的PMo/BWO_(9)具有优异光催化性能,可在90 min可见光照射下降解99.5%的MB。PMo/BWO_(9)的反应速率常数是BWO的4.18倍,且经过5次循环使用后,PMo/BWO_(9)对MB的降解效率仍在80%以上。能带分析表明,PMo和BWO之间形成Z型异质结,降低光生电子-空穴复合率,提升光催化效率。通过自由基猝灭实验和电子顺磁共振(EPR)测试发现,在光催化体系中空穴和超氧自由基(·O^(-)_(2))是MB降解的主要活性物种。

关键词：钨酸铋(Bi 2WO 6) 杂多酸光催化性能

Heat and mass transfer model optimization and annual energy efficiency analysis for energy recovery indirect evaporative cooling

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Building Simulation 2022年第7期15卷 1353-1365页

作者： Qilong liu Chunmei Guo Zhenjing Wu Yuwen You yan li School of Energy and Safety Engineering Tianjin Chengjian UniversityTianjin 300384China

Indirect evaporative cooling(IEC)is a kind of high efficiency,energy-saving and environmental protection cooling technology,which has been widely used in data centers and other fields in recent *** this paper,the optimized two-dimensional non-condensation state model of indirect evaporative cooling was *** the computer program was updated to solve the developed mathematical model under variable fresh air *** optimized model was verified by the experimental data,and the maximum deviation was only 4.6%.Based on the modified model and the annual hourly meteorological parameters in Tianjin,China,it was analyzed the optimal heat transfer area of IEC used as fresh air pre-cooling unit under various air volumes to provide references for system design and equipment ***,taking an IEC-primary return air conditioning system of a gymnasium as an example,the hourly energy-saving effect of whole year was simulated by the developed IEC *** simulation results showed that IEC could control the fresh air temperature below 27℃ and the moisture content below 18 g/kg throughout the year,and undertook 102.6% of the total fresh air cooling *** findings are useful in future system optimization and design of IEC equipment.

关键词： indirect evaporative cooling optimized model non-condensation state heat transfer area energy efficiency

Effective Shear Viscosity of Iron under Shock-Loading Condition

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Chinese Physics Letters 2011年第4期28卷 141-143页

作者： MA Xiao-Juan liU FU-Sheng SUN yan-Yun ZHANG Ming-Jian PENG Xiao-Juan li yong-Hong College of Physical Science and Technology Southwest Jiaotong UniversityChengdu 610031

We combine the flyer-impact experiment and improve the finite difference method to solve whether the shear viscosity coefficient of shock iron is more *** find that the numerical simulated profile agrees well with the measured one,from which the determined effective shear viscosity coefficients of shocked iron are 3000±100 Pa-sand 4000±100 Pa-s,respectively,at 103 GPa and 159 *** values are more than 2000±300 Pa-s of li Y L et al.[***.26(2009)038301]Our values are more reasonable because they are obtained from a comprehensive simulation for the full-shocked perturbation evolving process.

关键词： process viscosity shock

Impact wear properties of dissimilar joints between bainitic frogs and pearlite rails

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Journal of Iron and Steel Research International 2024年第1期31卷 275-287页

作者： Pin-yong Zeng Chun-guang Zuo Xiao-yu Zhang Wei li Tribology Research Institute Southwest Jiaotong UniversityChengdu610031SichuanChina

The impact wear behavior and damage mechanism of dissimilar welded joints between U26Mn frog and U75 V rail before and after normalizing treatment were studied by cyclic impact *** experiment indicated that the impact wear volume of the joints increased with the increasing number of impact *** main wear mechanisms include pitting wear,mild fatigue wear,delamination wear,and fatigue wear,and plastic deformation was the primary impact wear *** them,fatigue wear had the greatest influence on wear volume,while other wear mechanisms had limited *** impact wear resistance of the base material was better than that of the heat-affected *** treatment was beneficial to improving the impact wear resistance of welded joints owing to its effect to promote pearlite recovery,grain refinement,and uniform distribution of *** martensite generated in the rail welded joints aggravated the impact wear damage to the materials,which should be avoided.

关键词： Dissimilar welded joint Impact wear Bainitic steel Damage mechanism Wear rate

Robust-augmentation nonlinear dynamic inversion control of over-actuated coaxial high-speed helicopter in transition mode

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Chinese Journal of Aeronautics 2024年第8期37卷 404-420页

作者： Yuqing QIU yan li Jinxi LANG Yuxian liU Zhong WANG School of Automation Northwestern Polytechnical UniversityXi’an 710129China

As the elevator and rudder can be used actively for control,in addition to the rotors,Coaxial High-speed Helicopters(CHHs)have the problems of control redundancy and changing control authority in the transition *** paper presents a robust-augmentation transitioning flight control design for a CHH under the adverse conditions of parametric uncertainties and external ***,based on control characteristic analysis,an Adaptive Filtered Nonlinear Dynamic Inversion(AFNDI)controller is proposed for the angular rate to handle the effect of unknown unstructured uncertainties and external *** analysis proves that the presented angular rate controller can guarantee steady-state and transient ***,the attitude angle and velocity controllers are also ***,an Incremental-based Nonlinear Prioritizing Control Allocation(INPCA)method is designed to take into account control surface transition and changing control authority,which efficiently distributes the required moments between coaxial rotors and aero-surfaces,and avoids the control reversal problem of the yaw *** the proposed control architecture,the low-pass filter is introduced to alleviate the adverse influence of time delay and measurement ***,the effectiveness of the proposed controller is demonstrated through nonlinear numerical simulations,and is compared with existing *** results show that the proposed control law can improve both capabilities of disturbance rejection and fast response,and works satisfactorily for the CHH transitioning control characteristic.

关键词： Coaxial high-speed helicopter Transition mode Attitude control Control allocation Robust adaptive control

Physiological responses and algae inhibition of Pontederia cordata to simulated eutrophication and acid rain co-pollution

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Ecological Processes 2023年第1期12卷 764-777页

作者： yan li Xi Qi Jianpan Xin Chu Zhao Runan Tian College of Landscape Architecture Nanjing Forestry UniversityNanjing 210037JiangsuChina

Background Eutrophication and acid rain are two threats that many water bodies must contend *** and climate change have accelerated widespread outbreaks of cyanobacterial blooms as both have become more *** cordata,a garden ornamental plant,can inhibit some algae growth and remove total nitrogen(TN)and total phosphorus(TP)from the *** this study,we investigated how simulated acid rain and eutrophication co-pollution affected ***’s growth physiology and ability to inhibit algae *** Under mild eutrophication(2 mg·L^(−1)TN,0.4 mg·L^(−1)TP,and 15 mg·L^(−1)CODMn)or weak acid rain(pH=5.0),*** alleviated the degree of cell membrane lipid peroxidation by stabilizing superoxide dismutase(SOD)and catalase(CAT)activities in the leaves,allowing for normal plant *** mild eutrophication and acid rain conditions,cultured *** water samples maintained strong algae inhibition by reducing the Chl a content and SOD activity of Microcystis aeruginosa *** stress where acid rain was the primary inhibitory factor along with moderate or severe eutrophication inhibited *** growth,which probably reduced the input of algae-inhibiting allelochemicals,thus reducing its ability to inhibit *** In summary,*** has application potential in mild eutrophic water and acid rain(pH≥4).These findings provide guidance for further research on phytoremediation and algae control in scenarios of compound pollution.

关键词： Pontederia cordata Microcystis aeruginosa Eutrophication Acid rain pH Physiological response

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